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How to go back main screen when user logout app from any screen?

When i logout my app (press logout menu button) from second activity, then it redirect to login page but when i pressed back button again show second screen Activity, it should be goto main screen on back pressed, because i use finish() method but still not go to main screen. then what i do?
Here is my code.
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.second_adapter, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.logout_sec_Act) {
session.logoutUser();
finish();
Toast.makeText(Second_activity.this, "Logout...", Toast.LENGTH_LONG)
.show();
}
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}

That is because your previous activity is still in the back stack of your task. One way to solve it is by moving to a new empty task when you logout, something like this:
Intent logoutIntent = new Intent(this, MainActivity.class);
logoutIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(logoutIntent);

How to check if drop down menu of ActionBar is active

I'm using the ActionBar extending from the AppCompatActivity. How can I check, if the dropdown menu of the ActionBar is opened at the moment.
I've tried it in this method. But it does not fire if I open the drop down menu:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
Intent intent = new Intent();
Log.i("ActionBar", "ActionBar dropdown is open at this moment");
switch (item.getItemId()) {
case R.id.preferences:
intent.setClass(StartupActivity.this, PreferencesActivity.class);
startActivityForResult(intent, 0);
return true;
case R.id.info:
intent.setClass(StartupActivity.this, InformationActivity.class);
startActivityForResult(intent, 0);
return true;
case R.id.contact:
intent.setClass(StartupActivity.this, ContactActivity.class);
startActivityForResult(intent, 0);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
It only fires, if I click on an item of the drop down menu. But I want to check, if the user clicks on the three-dot menu.

Try the following method:
#Override
public boolean onMenuOpened(int featureId, Menu menu) {
// menu is open
return super.onMenuOpened(featureId, menu);
}

I've tried this method, it works:
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
// menu open
return super.onPrepareOptionsMenu(menu);
}
Even when initializing the menu, and not only when you click, but better than nothing.

on OptionsMenu click listener

I simply want to the options menu to toggle my sliding menu but havent found the standard click listener for the options button. Is OnPrepareOptionsMenu the only method that fires when clicking the options button? I don't really want to use this method because this method also gets fired when the application starts up.

UPDATE: for the menu button (hardware button), you can use the event onKeyUp:
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_MENU) {
if (event.getAction() == KeyEvent.ACTION_UP)
{
Log.d("onkeyup", "onkeyup");
return true;
}
}
return super.onKeyUp(keyCode, event);
}
NOTE: the solution below is for the ActionBar
Just override the onOptionsItemSelected function.
You can then listen the click event on all the menu items and trigger the actions you want according to the case:
Here is an example from a main activity class:
#Override
public boolean onOptionsItemSelected(MenuItem item){
switch(item.getItemId()) {
case R.id.menu_calendar:
makeToast("Loading...");
openCalendar();
break;
case R.id.menu_search:
makeToast("Loading...");
openSearch();
break;
case R.id.menu_settings:
openSettings();
break;
case R.id.menu_help:
openHelp();
break;
case R.id.menu_about:
mBackupManager.dataChanged();
openAbout();
break;
}
return true;
}

You need to Override menu button, so that when user clicks Menu your code would be executes instead of opening menu.Like this
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ( keyCode == KeyEvent.KEYCODE_MENU ) {
//Put the code for an action menu from the top here
return true;
}
return super.onKeyDown(keyCode, event);
}

how to override action bar back button in android?

I want to customize the activity back button in action bar, not in hard key back button. I have overriden the onBackPressed() method. It works with my emulator back button, but not with action bar back button.
I want it to happen with action bar. How can I do this?
Here is my code:
#Override
public void onBackPressed() {
Toast.makeText(getApplicationContext(),"Back button clicked", Toast.LENGTH_SHORT).show();
return;
}
I have used this toast whether back pressed is working or not but the actual implementation changes like to move back to previous activity. But this is not working with the button present on top of action bar (besides title of the activity).
Please any one could specify me the problem.

I think you want to override the click operation of home button. You can override this functionality like this in your activity.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
Toast.makeText(getApplicationContext(),"Back button clicked", Toast.LENGTH_SHORT).show();
break;
}
return true;
}

If you want ActionBar back button behave same way as hardware back button:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
onBackPressed();
return true;
}
return false;
}

Two things to keep in mind that the user can either press back button or press the actionbar home button.
So, if you want to redirect him to the same destination then you can do this.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
}
return false;
}
#Override
public void onBackPressed() {
super.onBackPressed();
Intent intent = new Intent(CurrentActivity.this, NextActivity.class);
startActivity(intent);
finish();
}
This will take the user to the intent pressing either key or the action bar button.

Sorry mine is a late answer, but for anyone else arriving at this page with the same question, I had tried the above:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
...
if (item.getItemId() == android.R.id.home) {
....
}
....
}
but this failed to catch the "Back" button press.
Eventually I found a method that worked for me on https://stackoverflow.com/a/37185334/3697478 which is to override the "onSupportNavigateUp()" as I am using the actionbar from the "AppCompatActivity" support library. (There is an equivalent "onNavigateUp()" for the newer actionbar/toolbar library.)
#Override
public boolean onSupportNavigateUp(){
finish();
return true;
}
and I removed the "android:parentActivityName=".MainActivity" section from the manifest file.

#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
break;
}
return true;
}

(1) Add Parent activity for your child activity (AndroidManifest.xml)
<activity
android:name=".ParentActivity" />
(2) override the onSupportNavigateUp method inside the child activity
#Override
public boolean onSupportNavigateUp() {
onBackPressed();
return false;
}

I have achieved this, by using simply two steps,
Step 1: Go to AndroidManifest.xml and in the add the parameter in tag - android:parentActivityName=".home.HomeActivity"
example :
<activity
android:name=".home.ActivityDetail"
android:parentActivityName=".home.HomeActivity"
android:screenOrientation="portrait" />
Step 2: in ActivityDetail add your action for previous page/activity
example :
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}

If you want to return to the previous instance of an Activity by pressing of ActionBar home button, without recreating it, you can override getParentActivityIntent method to use the one from the back stack:
#TargetApi(Build.VERSION_CODES.JELLY_BEAN)
#Override
public Intent getParentActivityIntent() {
return super.getParentActivityIntent().addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
}
EDIT:
Also you can achieve the same result by
setting the launchMode of your parent activity to singleTop.
So setandroid:launchMode="singleTop" to parent activity in your manifest.
Or you can use flag FLAG_ACTIVITY_CLEAR_TOP with the UP intent.
reference: Providing Up Navigation

#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == android.R.id.home) {
onBackPressed();
return true;
}
//noinspection SimplifiableIfStatement
if (id == R.id.signIn) {
return true;
}
return super.onOptionsItemSelected(item);
}
///////////////////
#Override
public void onBackPressed() {
super.onBackPressed();
finish();
}

There are several ways how to set up back button in bar:
1) method .setDisplayHomeAsUpEnabled(true); will do it, and then you can simply override android.R.id.home
2) adding <meta-data android:name="android.support.PARENT_ACTIVITY" android:value="my.package.parrent" /> in Android Manifest, but in this case you can not override android.R.id.home in OnOptionsMenuSelected.
.. for those who wonder why it doesn't work for them...

Cannot display Toast from an Activity other than my main activity

I have a Activity called main. If I call
Toast.makeText(this, "Hello World from main", Toast.LENGTH_SHORT);
this works fine. However, for every other activity in my application, I cannot display a Toast. No exception, nothing in the Log but I don't see the Toast.
My main activity starts another one with an options menu:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.main_menu_entry:
Intent infolist = new Intent(this, infolist.class);
startActivityForResult(infolist, R.layout.infolist);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
In my infolist activity I have another options menu which should display a Toast.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.infolist_menu_entry:
// this Toast is never shown.
Toast.makeText(this, "Hello World from infolist", Toast.LENGTH_Short);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
Any ideas what could cause this issue?
I am using the latest SDK with Min SDK Version = 3 and an 1.5 Emulator.

I would say, classical error :
You forgot the Toast.show() method ;)

You miss the show() method at the end.
Toast.makeText(this, "Hello World from infolist", Toast.LENGTH_Short).show();